from machine import Pin, PWM
import time

servo = PWM(Pin(15))

servo.freq(50)

servo.duty_u16(32768)

while True:
    servo.duty_u16(2000)
    time.sleep(1)

    servo.duty_u16(4915)
    time.sleep(1)

    servo.duty_u16(8000)
    time.sleep(1)